Korg MicroKey 25. 25-key MIDI controller keyboard (natural, velocity-sensitive mini-keyboard) Controls: Joystick, arpeggiator button, Sustain / TAP button. Octave Shift: -4 - +4. Connections: USB: Type B (x1). Power: Via USB bus. Power consumption: less than 100mA. Dimensions: microKEY-25: 395 x 131 x 53 mm. Weight: 0.65 Kg. Accessories: USB Cable, KORG BUNDLE SOFTWARE PIN Card. System Requirements; Mac: Supported computer: Apple Macintosh with USB port, meeting the system requirements for Mac OS X or Apple Macintosh with Intel support. Supported operating system: Mac OS X10.5 or later. Windows; Supported computer: Computer with USB port, meeting the system requirements for Microsoft Windows XP/ Vista/7. Supported operating system: Microsoft Windows XP SP3 (32bit), Microsoft Windows Vista SP2 (32bit, 64bit) or Windows 7 SP1 (32bit, 64bit)